Question: (a) Express cos 6 as a polynomial in cos . (b) Given z = cos + j sin show, by expanding (z +

(a) Express cos 6θ as a polynomial in cos θ.

(b) Given z = cos θ + j sin θ show, by expanding (z + 1/z)5(z –1/z)5 or otherwise, that

sin 0 cos0 = 1 -(sin 100 5 sin 60 2 + 10 sin 20)

sin 0 cos0 = 1 -(sin 100 5 sin 60 2 + 10 sin 20)

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